Set dont like to be cold

I would try going into the settings and seeing if any Audio Limitations are set.

Sometimes this cannot be controlled due to the devices connected to the TV set.

Also try to cold boot the TV by unplugging for 5/10 secs and plugging it back it.

1. From the Start screen, tap in the upper-right corner.
2. Tap Settings.
3. Scroll down and select About.

4.Tap the Reset your phone button.
5. Confirm your selection by selecting Yes. Then tap Yes again.
Your HTC HD7 will then go through the process of resetting to factory default settings.
Option 2 - Resetting using the hardware buttons
You can also use the buttons to perform a hard reset. This comes in handy if the screen is frozen and you can't access the phone.
1. Turn the phone off. If it's frozen or unresponsive, pull then replace the battery.
2. Press and hold the Volume Up and Volume Down buttons and power the phone back on.
3. Continue to hold Volume Up and Volume Down until a factory reset screen appears.

Assuming this is a pc laptop: check the sound settings in Windows control panel. Also check the volume settings in the system tray (the speaker icon in the box at the bottom right corner of the screen. The volume may be turned down or muted.

check capacitors cp150 cp114 cp120 if cp150 is puffed up on top it is Bad so replace other 2 as well.2200uf 16v and Two 220uf 35v.

I would not even touch it, if you JUST purchased it take it right back.......if your having problems with it straight out of the box its prob. not a good sign........

If you dont want to take it back , take out the battery and put it back in...plug it in and start it up again....take notice if there are any power lights on the laptop that turn on , or if there is no response from the laptop at all.....

If there are no lights it may be a problem with the ac adaptor or the power supply inside the computer.....

If there are lights and nothing on the screen then the LCD is faulty.

it just seems a setting problem.
go to AUDIO SETTINGS or MENU.it will have "ON VOLUME".
press volume control -ve to get desired volume.
press AUDIO or MENU to store volume level.Next time u turn it ON ,the volume will be what u SET. OK i hope this solves your problem.

hello Have radio on and then you have to hold down the SEL button on left for a few seconds. Then it will say "SET H" which is hour and turn volume dial left or right to move up or down. To set the minutes push either the left or right buttons on the selector on the far right. You can switch from minutes to hours here too. And once at "SET MIN" turn the volumes dial to go up or down. Hope it helps!! Took me a awhile to figure out (no manual here)

check on the speaker software were you can set master volumeetc. check for balance volume .

NO dont disregard the pwr supply,I would use the hot/cold fault finding aids first to isolate the problem aera. regards CHOOK.